81056672 has 24 divisors (see below), whose sum is σ = 163475172. Its totient is φ = 39539200.

The previous prime is 81056639. The next prime is 81056699. The reversal of 81056672 is 27665018.

It can be written as a sum of positive squares in 2 ways, for example, as 53640976 + 27415696 = 7324^2 + 5236^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29579 + ... + 32202.

Almost surely, 2^81056672 is an apocalyptic number.

81056672 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81056672 is an abundant number, since it is smaller than the sum of its proper divisors (82418500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81056672 is a wasteful number, since it uses less digits than its factorization.

81056672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61832 (or 61824 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81056672 is about 9003.1478939313. The cubic root of 81056672 is about 432.7757551823.

The spelling of 81056672 in words is "eighty-one million, fifty-six thousand, six hundred seventy-two".